Yeastar O2 Module (2FXO) YST-O2

Yeastar PBX systems. FXO (Foreign Exchange Office) ports are used to connect traditional analog phone lines (PSTN), making this module a practical solution for businesses that require integration of legacy landlines with modern VoIP systems.

This module supports a ring frequency range of 15–50 Hz and a ring voltage detection of 30+ VRMS, ensuring compatibility with various analog signals. It also comes with built-in echo cancellation for improved call clarity.

Compatible with a wide range of Yeastar PBX models—including S412, S20, S50, S100, S300, and the P-Series (P550, P560, P570)—the O2 module is ideal for businesses looking to enhance their communication infrastructure by bridging analog and digital telephony.

Key Features

• 2 RJ11 FXO ports for PSTN line connection

• Works with Yeastar S412, S20, S50, S100, S300, P550, P560, and P570

• 15–50 Hz ring frequency detection

• 30+ VRMS (varies with FXO mode)

• Supports PSTN analog lines

• Built-in echo cancellation support